package com.aurora.base.util;

import java.awt.Color;  
import java.awt.Font;  
import java.awt.Graphics2D;  
import java.awt.image.BufferedImage;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.OutputStream;  
import java.util.Random;  

import javax.imageio.ImageIO;  
/** 
* 验证码生成器 
* @author dsna 
* 
*/  
public class ValidateCode {  
  // 图片的宽度。  
  private int width = 160;  
  // 图片的高度。  
  private int height = 40;  
  // 验证码字符个数  
  private int codeCount = 5;  
  // 验证码干扰线数  
  private int lineCount = 150;  
  // 验证码  
  private String code = null;  
  // 验证码图片Buffer  
  private BufferedImage buffImg=null;  

  private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',  
          'K', 'L', 'M', 'N',  'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',  
          'X', 'Y', 'Z',  '1', '2', '3', '4', '5', '6', '7', '8', '9' };  

  public  ValidateCode() {  
      this.createCode();  
  }  

  /** 
   *  
   * @param width 图片宽 
   * @param height 图片高 
   */  
  public  ValidateCode(int width,int height) {  
      this.width=width;  
      this.height=height;  
      this.createCode();  
  }  
  /** 
   *  
   * @param width 图片宽 
   * @param height 图片高 
   * @param codeCount 字符个数 
   * @param lineCount 干扰线条数 
   */  
  public  ValidateCode(int width,int height,int codeCount,int lineCount) {  
      this.width=width;  
      this.height=height;  
      this.codeCount=codeCount;  
      this.lineCount=lineCount;  
      this.createCode();  
  }  
    
  public void createCode() {  
      int x = 0,fontHeight=0,codeY=0;  
      int red = 0, green = 0, blue = 0;  
        
      x = width / (codeCount +2);//每个字符的宽度  
      fontHeight = height - 2;//字体的高度  
      codeY = height - 4;  
        
      // 图像buffer  
      buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);  
      Graphics2D g = buffImg.createGraphics();  
      // 生成随机数  
      Random random = new Random();  
      // 将图像填充为白色  
      g.setColor(Color.WHITE);  
      g.fillRect(0, 0, width, height);  
      // 创建字体  
      ImgFontByte imgFont=new ImgFontByte();  
      Font font =imgFont.getFont(fontHeight);  
      g.setFont(font);  
        
      for (int i = 0; i < lineCount; i++) {  
          int xs = random.nextInt(width);  
          int ys = random.nextInt(height);  
          int xe = xs+random.nextInt(width/8);  
          int ye = ys+random.nextInt(height/8);  
          red = random.nextInt(255);  
          green = random.nextInt(255);  
          blue = random.nextInt(255);  
          g.setColor(new Color(red, green, blue));  
          g.drawLine(xs, ys, xe, ye);  
      }  
        
      // randomCode记录随机产生的验证码  
      StringBuffer randomCode = new StringBuffer();  
      // 随机产生codeCount个字符的验证码。  
      for (int i = 0; i < codeCount; i++) {  
          String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);  
          // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。  
          red = random.nextInt(255);  
          green = random.nextInt(255);  
          blue = random.nextInt(255);  
          g.setColor(new Color(red, green, blue));  
          g.drawString(strRand, (i + 1) * x, codeY);  
          // 将产生的四个随机数组合在一起。  
          randomCode.append(strRand);  
      }  
      // 将四位数字的验证码保存到Session中。  
      code=randomCode.toString();       
  }  
    
  public void write(String path) throws IOException {  
      OutputStream sos = new FileOutputStream(path);  
          this.write(sos);  
  }  
    
  public void write(OutputStream sos) throws IOException {  
          ImageIO.write(buffImg, "png", sos);  
          sos.close();  
  }  
  public BufferedImage getBuffImg() {  
      return buffImg;  
  }  
    
  public String getCode() {  
      return code;  
  }  
}  
